xref: /openbmc/bmcweb/include/ssl_key_handler.hpp (revision 1ff48780d3e8e4bc0dee01ae0e756eb4d46a4f53)
1 #pragma once
2 
3 #include <openssl/bio.h>
4 #include <openssl/dh.h>
5 #include <openssl/dsa.h>
6 #include <openssl/dsa.h>
7 #include <openssl/err.h>
8 #include <openssl/evp.h>
9 #include <openssl/pem.h>
10 #include <openssl/rand.h>
11 #include <openssl/rsa.h>
12 #include <openssl/ssl.h>
13 #include <boost/asio.hpp>
14 #include <g3log/g3log.hpp>
15 #include <random>
16 
17 namespace ensuressl {
18 static void init_openssl(void);
19 static void cleanup_openssl(void);
20 static EVP_PKEY *create_rsa_key(void);
21 static EVP_PKEY *create_ec_key(void);
22 static void handle_openssl_error(void);
23 
24 inline bool verify_openssl_key_cert(const std::string &filepath) {
25   bool private_key_valid = false;
26   bool cert_valid = false;
27 
28   LOG(DEBUG) << "Checking certs in file " << filepath;
29 
30   FILE *file = fopen(filepath.c_str(), "r");
31   if (file != NULL) {
32     EVP_PKEY *pkey = PEM_read_PrivateKey(file, NULL, NULL, NULL);
33     int rc;
34     if (pkey) {
35       int type = EVP_PKEY_type(pkey->type);
36       switch (type) {
37         case EVP_PKEY_RSA:
38         case EVP_PKEY_RSA2: {
39           LOG(DEBUG) << "Found an RSA key";
40           RSA *rsa = EVP_PKEY_get1_RSA(pkey);
41           if (rsa) {
42             if (RSA_check_key(rsa) == 1) {
43               // private_key_valid = true;
44             } else {
45               LOG(WARNING) << "Key not valid error number " << ERR_get_error();
46             }
47             RSA_free(rsa);
48           }
49           break;
50         }
51         case EVP_PKEY_EC: {
52           LOG(DEBUG) << "Found an EC key";
53           EC_KEY *ec = EVP_PKEY_get1_EC_KEY(pkey);
54           if (ec) {
55             if (EC_KEY_check_key(ec) == 1) {
56               private_key_valid = true;
57             } else {
58               LOG(WARNING) << "Key not valid error number " << ERR_get_error();
59             }
60             EC_KEY_free(ec);
61           }
62           break;
63         }
64         default:
65           LOG(WARNING) << "Found an unrecognized key type " << type;
66           break;
67       }
68 
69       if (private_key_valid) {
70         X509 *x509 = PEM_read_X509(file, NULL, NULL, NULL);
71         if (!x509) {
72           LOG(DEBUG) << "error getting x509 cert " << ERR_get_error();
73         } else {
74           rc = X509_verify(x509, pkey);
75           if (rc == 1) {
76             cert_valid = true;
77           } else {
78             LOG(WARNING) << "Error in verifying private key signature "
79                          << ERR_get_error();
80           }
81         }
82       }
83 
84       EVP_PKEY_free(pkey);
85     }
86     fclose(file);
87   }
88   return cert_valid;
89 }
90 
91 inline void generate_ssl_certificate(const std::string &filepath) {
92   FILE *pFile = NULL;
93   LOG(WARNING) << "Generating new keys";
94   init_openssl();
95 
96   // LOG(WARNING) << "Generating RSA key";
97   // EVP_PKEY *pRsaPrivKey = create_rsa_key();
98 
99   LOG(WARNING) << "Generating EC key";
100   EVP_PKEY *pRsaPrivKey = create_ec_key();
101   if (pRsaPrivKey) {
102     LOG(WARNING) << "Generating x509 Certificate";
103     // Use this code to directly generate a certificate
104     X509 *x509;
105     x509 = X509_new();
106     if (x509) {
107       // Get a random number from the RNG for the certificate serial number
108       // If this is not random, regenerating certs throws broswer errors
109       std::random_device rd;
110       int serial = rd();
111 
112       ASN1_INTEGER_set(X509_get_serialNumber(x509), serial);
113 
114       // not before this moment
115       X509_gmtime_adj(X509_get_notBefore(x509), 0);
116       // Cert is valid for 10 years
117       X509_gmtime_adj(X509_get_notAfter(x509), 60L * 60L * 24L * 365L * 10L);
118 
119       // set the public key to the key we just generated
120       X509_set_pubkey(x509, pRsaPrivKey);
121 
122       // Get the subject name
123       X509_NAME *name;
124       name = X509_get_subject_name(x509);
125 
126       X509_NAME_add_entry_by_txt(name, "C", MBSTRING_ASC, (unsigned char *)"US",
127                                  -1, -1, 0);
128       X509_NAME_add_entry_by_txt(name, "O", MBSTRING_ASC,
129                                  (unsigned char *)"Intel BMC", -1, -1, 0);
130       X509_NAME_add_entry_by_txt(name, "CN", MBSTRING_ASC,
131                                  (unsigned char *)"testhost", -1, -1, 0);
132       // set the CSR options
133       X509_set_issuer_name(x509, name);
134 
135       // Sign the certificate with our private key
136       X509_sign(x509, pRsaPrivKey, EVP_sha256());
137 
138       pFile = fopen(filepath.c_str(), "wt");
139 
140       if (pFile) {
141         PEM_write_PrivateKey(pFile, pRsaPrivKey, NULL, NULL, 0, 0, NULL);
142 
143         PEM_write_X509(pFile, x509);
144         fclose(pFile);
145         pFile = NULL;
146       }
147 
148       X509_free(x509);
149     }
150 
151     EVP_PKEY_free(pRsaPrivKey);
152     pRsaPrivKey = NULL;
153   }
154 
155   // cleanup_openssl();
156 }
157 
158 EVP_PKEY *create_rsa_key(void) {
159   RSA *pRSA = NULL;
160   EVP_PKEY *pKey = NULL;
161   pRSA = RSA_generate_key(2048, RSA_3, NULL, NULL);
162   pKey = EVP_PKEY_new();
163   if (pRSA && pKey && EVP_PKEY_assign_RSA(pKey, pRSA)) {
164     /* pKey owns pRSA from now */
165     if (RSA_check_key(pRSA) <= 0) {
166       fprintf(stderr, "RSA_check_key failed.\n");
167       handle_openssl_error();
168       EVP_PKEY_free(pKey);
169       pKey = NULL;
170     }
171   } else {
172     handle_openssl_error();
173     if (pRSA) {
174       RSA_free(pRSA);
175       pRSA = NULL;
176     }
177     if (pKey) {
178       EVP_PKEY_free(pKey);
179       pKey = NULL;
180     }
181   }
182   return pKey;
183 }
184 
185 EVP_PKEY *create_ec_key(void) {
186   EVP_PKEY *pKey = NULL;
187   int eccgrp = 0;
188   eccgrp = OBJ_txt2nid("prime256v1");
189 
190   EC_KEY *myecc = EC_KEY_new_by_curve_name(eccgrp);
191   if (myecc) {
192     EC_KEY_set_asn1_flag(myecc, OPENSSL_EC_NAMED_CURVE);
193     EC_KEY_generate_key(myecc);
194     EVP_PKEY *pKey = EVP_PKEY_new();
195     if (pKey) {
196       if (EVP_PKEY_assign_EC_KEY(pKey, myecc)) {
197         /* pKey owns pRSA from now */
198         if (EC_KEY_check_key(myecc) <= 0) {
199           fprintf(stderr, "EC_check_key failed.\n");
200         }
201       }
202       EVP_PKEY_free(pKey);
203       pKey = NULL;
204     }
205     EC_KEY_free(myecc);
206     myecc = NULL;
207   }
208   return pKey;
209 }
210 
211 void init_openssl(void) {
212   if (SSL_library_init()) {
213     SSL_load_error_strings();
214     OpenSSL_add_all_algorithms();
215     RAND_load_file("/dev/urandom", 1024);
216   } else
217     exit(EXIT_FAILURE);
218 }
219 
220 void cleanup_openssl(void) {
221   CRYPTO_cleanup_all_ex_data();
222   ERR_free_strings();
223   ERR_remove_thread_state(0);
224   EVP_cleanup();
225 }
226 
227 void handle_openssl_error(void) { ERR_print_errors_fp(stderr); }
228 inline void ensure_openssl_key_present_and_valid(const std::string &filepath) {
229   bool pem_file_valid = false;
230 
231   pem_file_valid = verify_openssl_key_cert(filepath);
232 
233   if (!pem_file_valid) {
234     LOG(WARNING) << "Error in verifying signature, regenerating";
235     generate_ssl_certificate(filepath);
236   }
237 }
238 
239 boost::asio::ssl::context get_ssl_context(std::string ssl_pem_file) {
240   boost::asio::ssl::context m_ssl_context{boost::asio::ssl::context::sslv23};
241   m_ssl_context.set_options(boost::asio::ssl::context::default_workarounds |
242                             boost::asio::ssl::context::no_sslv2 |
243                             boost::asio::ssl::context::no_sslv3 |
244                             boost::asio::ssl::context::single_dh_use |
245                             boost::asio::ssl::context::no_tlsv1 |
246                             boost::asio::ssl::context::no_tlsv1_1);
247 
248   // m_ssl_context.set_verify_mode(boost::asio::ssl::verify_peer);
249   m_ssl_context.use_certificate_file(ssl_pem_file,
250                                      boost::asio::ssl::context::pem);
251   m_ssl_context.use_private_key_file(ssl_pem_file,
252                                      boost::asio::ssl::context::pem);
253 
254   // Set up EC curves to auto (boost asio doesn't have a method for this)
255   // There is a pull request to add this.  Once this is included in an asio
256   // drop, use the right way
257   // http://stackoverflow.com/questions/18929049/boost-asio-with-ecdsa-certificate-issue
258   if (SSL_CTX_set_ecdh_auto(m_ssl_context.native_handle(), 1) != 1) {
259     CROW_LOG_ERROR << "Error setting tmp ecdh list\n";
260   }
261 
262   // From mozilla "compatibility"
263   std::string ciphers =
264       "ECDHE-ECDSA-CHACHA20-POLY1305:"
265       "ECDHE-RSA-CHACHA20-POLY1305:"
266       "ECDHE-ECDSA-AES128-GCM-SHA256:"
267       "ECDHE-RSA-AES128-GCM-SHA256:"
268       "ECDHE-ECDSA-AES256-GCM-SHA384:"
269       "ECDHE-RSA-AES256-GCM-SHA384:"
270       "DHE-RSA-AES128-GCM-SHA256:"
271       "DHE-RSA-AES256-GCM-SHA384:"
272       "ECDHE-ECDSA-AES128-SHA256:"
273       "ECDHE-RSA-AES128-SHA256:"
274       "ECDHE-ECDSA-AES128-SHA:"
275       "ECDHE-RSA-AES256-SHA384:"
276       "ECDHE-RSA-AES128-SHA:"
277       "ECDHE-ECDSA-AES256-SHA384:"
278       "ECDHE-ECDSA-AES256-SHA:"
279       "ECDHE-RSA-AES256-SHA:"
280       "DHE-RSA-AES128-SHA256:"
281       "DHE-RSA-AES128-SHA:"
282       "DHE-RSA-AES256-SHA256:"
283       "DHE-RSA-AES256-SHA:"
284       "ECDHE-ECDSA-DES-CBC3-SHA:"
285       "ECDHE-RSA-DES-CBC3-SHA:"
286       "EDH-RSA-DES-CBC3-SHA:"
287       "AES128-GCM-SHA256:"
288       "AES256-GCM-SHA384:"
289       "AES128-SHA256:"
290       "AES256-SHA256:"
291       "AES128-SHA:"
292       "AES256-SHA:"
293       "DES-CBC3-SHA:"
294       "!DSS";
295 
296   // From mozilla "modern"
297   std::string modern_ciphers =
298       "ECDHE-ECDSA-AES256-GCM-SHA384:"
299       "ECDHE-RSA-AES256-GCM-SHA384:"
300       "ECDHE-ECDSA-CHACHA20-POLY1305:"
301       "ECDHE-RSA-CHACHA20-POLY1305:"
302       "ECDHE-ECDSA-AES128-GCM-SHA256:"
303       "ECDHE-RSA-AES128-GCM-SHA256:"
304       "ECDHE-ECDSA-AES256-SHA384:"
305       "ECDHE-RSA-AES256-SHA384:"
306       "ECDHE-ECDSA-AES128-SHA256:"
307       "ECDHE-RSA-AES128-SHA256";
308 
309   std::string lighttp_ciphers = "AES128+EECDH:AES128+EDH:!aNULL:!eNULL";
310 
311   if (SSL_CTX_set_cipher_list(m_ssl_context.native_handle(), ciphers.c_str()) !=
312       1) {
313     CROW_LOG_ERROR << "Error setting cipher list\n";
314   }
315   return m_ssl_context;
316 }
317 }